How to Price a Shower Installation: Electric, Power and Thermostatic Trade Rates

Quick Answer: A typical UK shower installation in 2026 prices £180–£380 fitted for an electric shower (excluding the unit at £130–£450), £280–£650 fitted for a thermostatic mixer onto an existing tray, and £1,800–£4,500 for a complete shower enclosure with new tray, screen, valve and tiling. Electric shower work in a bathroom is notifiable under Building Regulations Part P and must comply with BS 7671 zone rules; thermostatic mixer installations on an unvented system have no Part P trigger but the cylinder install does fall under Part G3.

Summary

Shower pricing splits cleanly along three modalities: electric (single-point heating, cold-feed only), mixer (uses the property's hot and cold supply, valve mixes the two), and power (mixer with an integral pump). The labour-only rate looks similar across the three — usually a half-day to a day for a competent plumber-electrician — but the surrounding works diverge sharply. Electric showers need a dedicated 32A or 40A circuit, supplementary bonding, and a ceiling-mounted pull-cord isolator. Thermostatic mixers need an isolated hot and cold feed with adequate balanced pressure. Power showers need a pump location, a vibration-isolated mount, and an electrical spur. Each modality changes the line items, not just the headline price.

The single most over-promised number in shower pricing is "fitted from £150." That figure is achievable only on a like-for-like swap where the same circuit, same pipework, same waste, and same tiles already exist in the right place. A first-time install — running a new 6 mm or 10 mm cable to a 40A MCB, chasing the wall for the shower valve back-box, dropping a waste, and tanking behind a new screen — is a £600–£1,500 job before the unit cost. Honest quotes show those line items separately so the homeowner sees what changes if they pick a different shower.

The water pressure check is the line item most often skipped. A thermostatic mixer needs 1.0–3.0 bar balanced; a power shower wants 1.5–3.0 bar; an electric shower runs on cold mains alone but still needs at least 0.7–1.0 bar dynamic pressure for most modern units. Quoting a thermostatic mixer install on a property fed from a low-pressure gravity tank without confirming pressure first is how a £400 install becomes a £1,200 problem when the customer complains the shower trickles.

Key Facts

Quick Reference Table

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Job type Labour fitted Materials typical Total Time on site
Electric shower swap (same circuit, same pipework) £180–£380 £130–£450 unit + £20 sundries £330–£850 2–4 hours
Electric shower first install (new 10 mm cable to CU) £450–£950 £150–£500 unit + £80–£180 cable, MCB, isolator £680–£1,630 1 day
Thermostatic mixer onto existing tray £280–£650 £150–£800 valve + £40–£90 sundries £470–£1,540 4–8 hours
Power shower install with pump under bath £450–£900 £300–£900 unit + £40–£100 sundries £790–£1,900 1 day
Replace tray and screen, retain valve £450–£900 £320–£870 (tray + screen + tanking) £770–£1,770 1–2 days
Full enclosure 800 × 800 quadrant + thermostatic + tile £1,200–£2,500 £600–£2,000 fittings + £300–£800 tile £2,100–£5,300 2–4 days
Full enclosure 1200 × 800 walk-in + slider door £1,400–£2,800 £900–£2,800 fittings + £400–£1,000 tile £2,700–£6,600 3–5 days
Convert bath into shower enclosure £1,800–£3,800 £600–£2,200 fittings + £300–£1,000 tile £2,700–£7,000 3–6 days

Detailed Guidance

Electric showers — pricing, Part P and the cable run

An electric shower heats cold mains water at the unit. Output is rated in kilowatts: 8.5 kW is the budget point, 9.5 kW is mid-range, 10.5 kW is mainstream premium, and 11–12.5 kW exists for properties with strong incoming mains. Power dictates flow rate at temperature — an 8.5 kW unit gives roughly 3.0 L/min at 38 °C in a UK winter, a 10.5 kW gives 4.0 L/min at the same temperature.

Cable size is set by power rating, not unit choice:

The cable must terminate at a ceiling-mounted 45A or 50A double-pole pull-cord isolator (Zone 1 location, IPX4 minimum) before entering the shower unit. Wall-mounted pull-cord switches inside the bathroom are not permitted.

Labour for a like-for-like swap is 2–4 hours: isolate at consumer unit, drain the unit through, mount new bracket, transfer cable, fit and commission. Labour for a first-time install adds the cable run from consumer unit to bathroom (typically 8–18 m on a 3-bed semi), chase work, MCB upgrade, and Part P notification. See cable sizing for shower circuits for the BS 7671 voltage-drop maths.

Thermostatic mixer valves — pressure, valve type and tile chase

A thermostatic mixer takes the property's hot and cold supply, mixes them at a temperature-stable cartridge, and delivers a fixed-temperature feed to the head. The standard fitting profile is BSP 1/2" male inlets at 150 mm centres on a wall-mounted exposed valve, or 15 mm push-fit / compression on a concealed valve sat in a back-box behind plasterboard.

Key choice: pressure-balanced vs thermostatic. Pressure-balanced valves (sometimes called manual mixers) react to flow changes — when someone flushes a toilet, the cold pressure drops, and the valve closes the hot proportionally to stop scalding. They cost £40–£150 supplied. Thermostatic valves use a wax cartridge that reacts to outlet temperature directly; they hold ±1 °C, shut down within 2 seconds if cold supply fails, and are required by TMV2 / TMV3 specs in healthcare and care environments. They cost £150–£800 supplied. For domestic family bathrooms, thermostatic is now the default — pressure-balanced is rare new-build but still found on swap-outs. See TMV2 and TMV3 valve specification for the full standards.

Pressure compatibility:

Always check pressure before quoting. A £20 pressure gauge on the cold and hot outlet at the proposed shower location settles it in 5 minutes.

Power showers — pump location, electrical spur and noise

A power shower is a mixer plus an electrical pump. They were a 1990s/2000s mainstay for gravity-fed properties; they remain the simplest fix for low-pressure systems where replacing the cylinder is not viable. Output is rated in bar: 1.5 bar is entry-level, 2.0–3.0 bar is standard, 3.5+ bar is high-output.

Pricing covers the unit (£300–£900), the pump location (under bath, in airing cupboard, in loft), the vibration-isolation mount (anti-vibration pad and flexible braided hoses), and the fused spur (3A switched fused spur on a Zone 2-compliant location, fed from a 13A circuit). Allow £450–£900 labour for a competent installation including pump positioning, anti-vibration mounting, electrical spur, and pipework adaptation.

Two failure modes drive call-back rates: pump cavitation (pump pulling on a tank that has run dry, damaging the impeller) and noise transfer (rigid pipework and rigid mounts transmitting hum into bedrooms above). Quote the anti-vibration mount and braided flexible inlets explicitly — they are £20–£40 in materials and prevent the most common warranty claim.

Tray, screen and tanking — the £700–£3,000 line

When the install includes a new tray and screen, costs accumulate fast. A budget acrylic-capped resin tray (1700 × 700 mm) is £140–£300 supplied; a stone-resin low-profile tray is £280–£650; a quartz-composite premium tray is £700–£1,400. Trays heavier than 30 kg need bedding on a sand-and-cement bed for support; lighter trays sit on a perimeter foam strip and the manufacturer's leg set.

Screen options range from a single-panel hinged door (£180–£450 supplied) through bi-fold (£280–£600), to walk-in fixed panel with optional return (£350–£900), to a frameless full-height enclosure (£700–£1,800). Toughened safety glass to BS 6206 is mandatory at 6 mm minimum, 8 mm preferred for stability.

Tanking — the waterproof membrane behind tile in the wet zone — is non-negotiable for shower areas. A liquid tanking system (cementitious or polyurethane to BS 8000-11) covers the tray-up height to 1.8 m on all wetted walls plus 300 mm beyond the spray zone. Material allowance is £80–£180 for a single shower; labour is 2–4 hours on a clean substrate. See bathroom tanking and wet-zone waterproofing for the specification detail.

Part P, BS 7671 zones and supplementary bonding

Every electrical task in a UK bathroom is performed in a "special location" — the most heavily-regulated category in BS 7671. The zone classification governs what equipment is permitted where:

Supplementary equipotential bonding (4 mm² green-yellow bonding all extraneous-conductive parts together at one point) is required where:

Modern installations with split-load 30 mA RCD or RCBO consumer units and properly-sized main bonding usually do not require additional supplementary bonding (BS 7671 Regulation 701.415.2 exception). The electrician confirms via continuity test before signing off — this test is the one most commonly skipped and the one Building Control inspectors most commonly fail. See bathroom electrical zone classification for the IP rating tables.

Part P notification is automatic for a registered electrician via Competent Person Scheme (NICEIC, NAPIT, ELECSA, Stroma). For an unregistered installer or DIY work, the homeowner must notify Local Authority Building Control before starting (£200–£400 fee) and arrange first-fix and second-fix inspections.

Unvented system trigger

When a shower install requires upgrading the hot water supply (typically a thermostatic shower spec'd at 2 bar+ on a property with a low-pressure vented cylinder), the cylinder swap is a separate job under Building Regulations Part G3. That is a G3-ticketed engineer job, notifiable, and adds £1,400–£2,800 to the quote — see hot water cylinder replacement pricing for the breakdown. Quoting a high-output shower without flagging the cylinder upgrade is the second-most-common reason a £600 install becomes a £3,500 invoice.

Frequently Asked Questions

How much does it cost to install a new shower in the UK?

For a like-for-like electric shower swap, expect £330–£850 all-in. For a first-time electric shower install with a new circuit, £680–£1,630. For a thermostatic mixer onto an existing tray, £470–£1,540. For a complete shower enclosure with tray, screen, valve, and tiling, £2,100–£5,300. Walk-in level-access and full wet rooms run higher — see the wet room pricing guide.

Why does a "simple" shower swap quote vary so much?

Three line items drive variance: cable size and run length (electric only), pressure compatibility (mixer/power only), and tile reinstatement (most installs damage 2–6 tiles around the bracket and back-box). A quote that says "supply and fit from £150" is using the unit price plus 1 hour's labour as a hook — it omits cable upgrade, isolator replacement, supplementary bonding, tile reinstatement, and any pipework adjustment.

Do I need a special electrician for an electric shower?

Yes — the electrical work is Part P notifiable in a special location. The installer must be either a Competent Person Scheme member (self-certifies via NICEIC/NAPIT/ELECSA/Stroma) or working under a third-party scheme submission. Without that, the work is not lawfully notified and the homeowner has no Building Regulations Compliance Certificate, which is a problem at sale.

Why won't my mixer shower run hot?

Pressure mismatch is the most common cause. A thermostatic mixer fed from gravity hot and mains cold will lock to the cold side because the cold has overwhelming dominance. The fix is either to fit a shower pump on the hot side (single-impeller) or, for both feeds, a twin-impeller pump — or to convert the system to combi or unvented cylinder. Diagnostic check: a £20 pressure gauge at each feed in turn shows you which side is starving the mix.

Can I keep my electric shower on the existing 6 mm cable?

Up to 9.5 kW yes, on a 40A MCB and a sub-50 m cable run. Above 9.5 kW the cable needs upgrading to 10 mm². The voltage drop limit (5% under BS 7671 Table 4Ab) bites at long runs — a 9.5 kW shower on 6 mm cable at 25 m is borderline; at 35 m you need 10 mm. The electrician runs the calc at quote stage. See voltage drop calculation worked examples.

Regulations & Standards